-$ID$
+$Id$
= embedded =
== index handling ==
-
For avidemux I currently have a big patch doing memory optimized index handling.
It basically thins out the index to save memory. Right now it only keeps index
entries marked with the avi keyframe flag.
This way the different requirements of desktop and embedded platforms could be
encapsulated in the indexer strategy.
+== ranking ==
+Autopluggers like playbin and decodebin use the element caps plus static ranks
+to create piplines.
+The rank of an elemnt right now refers to the quality/maturity of the element.
+Elements with higher rank should be functionally more complete. If we have
+multiple elements that are feature complete there is a draw.
+
+There are more decission criteria thinkable:
+* target processor (CPU,DSP,GPU)
+* ressource usage (CPU, memory)
+* license (proprietary, open source)
+* quality (in terms of the audio/image quality)
+
+One problem of taking criteria like quality and performance into account when
+autoplugging, is that elements might have objects-properties that influence
+them.
+
+Beside adding more ranking criteria, we might consider adding an overridable
+mechanism for picking elements (basically registry filters that not decide on
+the base of ranks). Applications might choose the filter mechanism based on the
+use-case (which gstreamer not know right now).
+
+== g_malloc vs. g_try_malloc ==
+g_malloc/g_new should not be used when allocating space of a size that is
+derived from a value found in the file. Instead one should use g_try_malloc or
+g_try_new and check the return value.
+
+$ find . -name "*.c" -exec grep "g_malloc" {} \; | wc -l
+190
+$ find . -name "*.c" -exec grep "g_try_malloc" {} \; | wc -l
+0
+$ find . -name "*.c" -exec grep "g_new" {} \; | wc -l
+398
+$ find . -name "*.c" -exec grep "g_try_new" {} \; | wc -l
+3
+
+This is not strickly related to embedded, but its easier to crash gstreamer on
+embedded this way.
projects / platform / upstream / gstreamer.git / blobdiff